Auxiliary raisable chair seat



Patented Sept. 5, 1950 2,521,281 AUXILIARY ltAISABLE lGHAIR SEAT itenlir-ousseau, Montreal, Quebec, Canada, as-

s n r to. Better Se t .0 Montre Qu bec,

Canad Application December 3, 1946, Serial No. 713,723

l 2 Claims.

The present invention relatesto chairseats and, more particularly, sucha seat adapted to, be used in conjunction with a chair and raisablethere from.

The main object of the invention, therefore, resides in the provision ofimproved means for increasing the. effective height of a chair seat.

Another object is the. provision of an auxiliary seat of the characterdescribed which is highly efficient and versatile for the purpose, inView.

A further object concerns an auxiliary seat which is. rigidly attachableto a chair in a remove able manner.

Still another object contemplates a chair auxiliary seat which isrugged, simple. and easy to adjust.

A still further object envisages a seat of the character described,which is easily produced at relatively low cost.

th r: b ec nd advan ages of he i n i will become apparent, or be p tedout further, during th description tov follow.

As an example, and for purposes of illustration only, an embodiment ofthe invention is shown in the annexed drawing, wherein:

Figure 1 is a side elevational. view showing. the invention in use,

Figure 2 is a perspective view of the auxiliary seat attached to anordinary chair,

Figure-3 is a side elevational View of the seat of the invention,

Figure 4 is a detailed sectional View taken on line 4-4 of Figure 3,

Figure 5 is a partial front elevation view of one corner of theauxiliary seat, and

Figure 6 is a view similar to Figure 3, but showing, in enlarged form,the supporting means from the inside.

Referring to the drawings, wherein similar reference charactersrepresent corresponding parts throughout, the reference letter Cindicates generall an ordinary chair to which the auxiliary seat A ofthe invention is removably secured. As shown to advantage in Figures 1and 2, the auxiliary seat is adapted to be adjustably elevated orlowered with respect to the chair C, the mechanism for eifectuating thisadjustment forming the subject-matter of the present invention.

The mechanism noted above consists essentially of a plurality of togglejoints J, one of which is secured to each corner of the auxiliary seat,said joints being connected in pairs to transverse spaced parallel basebars l0 resting on the seat of the chair C and removably secured theretoby special clamps H to be described later.

T e. toggle o n are s cured to h s t A by means o a b ac t '2 ha a Q n a-lv depend-ing ear l3 to which car the upper link [4 of th t g le jo nts iv t or otherwise ivot d- The lower link [5 is in turn riveted at itslower end o. a mil r ra ket i g an up a d n ar 2 said r ke being t c e osecu d d: la nt the c rend ro and r ar a ev bars .0710: re p cti ly, ndada ted o. o n each, the front toggles of the seat and the rear togglesher f Th inn nd of the inks M a d I5 are pivoted et e b m ans of a b '3.ha n a tightening wing nut 2 -I-. Thus, from the mechanism described: sofar, it will be readily vident that the auxiliary seat A maybe raised orlowered from the seat, of the chair (3; whenever the toggle j ints. areextended or collapsed.

The correct positioning ofthe toggles, in strictly similarangularrelation between each other, is efiectuated by means of spurs 25,one of which is associated with each toggle by pivoting one end thereofover the boltv t9 already disclosed and joining together the inner endsof the links 141-115 the lower end of the spur is cut at an f angle toform a sharp edge adapted to engage. the

ratchet teeth 26 formedin the upper surface oi a crossbar 21 disposedright, angularly with respect to, the bars l:ll;,,2ll:, each of saidcross bars 21 joining together in proper spaced relation the outer endof the base bars, so as to form a square frame.

The teeth 26 being symmetrically disposed with respect to the toggles,as shown clearl in Figures 2, 3 and 6, the extension of the toggles willbe strictly identical at all corners provided the spurs are each engagedwith the proper tooth, this adjustment being easily effectuated bycounting or otherwise. For a, purpose to be apparent later on, the crossbars 21 are provided with upstanding end flanges 28 the effective heightof which above the bars 21 must be slightly more than the combinedthickness of the joints J, spurs 25 and other mechanism when completelycollapsed downwardly; in other words, the said flanges 28 act primarilyas a stop against which the auxiliary seat A may rest when in its lowestposition.

As already mentioned, the spurs 25 are useful for blocking inwardmovement of the toggles and also for correctly positioning the same;since, however, the said spurs are not effective to prevent outwardmovement of the toggles, tension arms 30 are also mounted on one endonto the pivot bolt l9, said arms converging centrall together towardsthe bracket 3| having the depending ear 32 supporting the screw 33.- Theouter end of the arms is slotted to allow passage of the screw 33therethrough, the arms being clamped together and to the ear 32 by meansof a win nut 35.

Thus, the position of the toggles is at all times rigidly maintained bythe spurs and also by the arms which additionall resist any tendency ofthe toggles to change their position. As a result, the elevatingstructure for the auxiliary seat A is a rigid linkage having greatstrength for supporting substantial weights and so interconnected as tosustain successfully any tipping tendency caused by applying a weight tothe edge or a corner of the auxiliary seat.

The means for securing the frame of the auxiliary seat to an ordinarychair consist in the clamps I I which are adapted to secure the frame tothe seat of the chair C. For that purpose, the clamps in question engagetoothed extension 40 formed at the end of the base bar Ill and a thirdextension 4| connected right angularly to the centre of the rear basebar 20. As shown to advantage in Figure 5, for instance, the clamps IIhave a yoke 45 engageable by the teeth of the extension, said engagementbeing maintained by a spring finger 46 contacting the underside of theseat of the chair C and adjustably secured to the yoke 45 by means ofthe screws 41 for adapting the clamp to varying thicknesses of chairseats.

From the foregoing description, the operation of the auxiliary seatshould be fairly obvious: primarily, it is intended to serve as anattachment permitting the use of ordinary chairs by children who,otherwise, would not be able to sit properly at the dining table, forinstance. Obviously the seat may be used by anyone for specific purposesalthough, in any case, the auxiliary seat A would have to be smallerthan the seat of the chair to which it is attached so as to leave thenecessary extension for clamping purposes and the like.

Due to the adjustable feature, the auxiliary seat is easily applicableto variously aged children, or used constantly by one child and adjusteddownwardly in accordance with the growth of said child, thus giving hima new measure of confidence and allowing him to acquire early propertable manners with adults.

From the foregoing it must be realized that the present invention is anadvance of the art in that it provides an adjustable auxiliary seatwhich is strong, easily adjustable and which, once adjusted remainsrigidly in position Without tipping or other deformation tendencies.Again, the said auxiliary seat may be quickly adapted for attachment toordinary chairs without; marring same or necessitating drilling, nailingor other defacing operations.

It must be understood various changes as to the shape, size andarrangement of parts may be resorted to without departing from thespirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim: 1. In an auxiliary seat fora chair, adjustable in height relative thereto, a quadrangular framesecurable to the chair, a pair of toggle links at each corner of saidframe, an auxiliary seat supported by said links, the links of each pairbeing pivoted together and at their outer end to the frame and seatrespectively, arms pivoted to the links pivots and meeting in pairscentrally be neath the seat, and means for releasably clamping said armsin pairs to prevent outward spreading of the toggle links.

2. In an auxiliary seat for a chair, adjustable in height relativethereto, a quadrangular frame securable to the chair, a pair of togglelinks at each corner of said frame, an auxiliary seat supported by saidlinks, the links of each pair being pivoted together and at their outerend to the frame and seat respectively, arms pivoted to the links pivotsand meeting in pairs centrally be neath the seat, means for releasablyclamping said arms in pairs and to said seat to prevent outwardspreading of the toggle links, and means limiting movement of thelinksjnwardly.

RENE BROUSSEAU.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS France Apr. 10, 1933

